Scarifying tooth



May 24, 1932. A. B. WILSON SCARIFYING TOOTH Filed Feb. 27, 1931 Patented May 24, 1932 l v UNITED STA S PATENT: lorries Y Application filed February 27, 1931. Serial No. 518,656.

This invention relates to ascarifying tooth that the temptation to continue operating and has for its purpose to provide a scarifywith excessively dull teeth is not so great. ing tooth which will be self sharpening for a Also the invention reduces the cost of sharpconsiderable period of time to a sufficient exeni'ng and renewing the teeth. 7 tent so that it will continue to operate. The particulars of the invention will be The specific use for which the new tooth understood from the accompanying drawings has been employed is to scarify or dig up ShOWmg one embodiment thereof. the surface of a road preparatory to smoothig l illustfiites the n w 500th i ing the road. This is particularly applicable F 1g. 2 is an enlarged detail of'the end 1 to gravel roads, gravel and tar, and similar the tooth as it first appears;

roads. In such cases the surface frequently Fig. 3 is a view similar toFig. 2, but ilbecomcs roughened and if, is necessary in lustrating the appearance the end Of the order to produce a smooth surface which will 0 th after it has been in use for a while, and remain smooth for any appreciable length of Fig. 4: is a section on the line H of Fig. 2. r I time, to dig into the surface of the road so In the embodiment of the invention iliusthat the smooth surface will be properly trate'd there is a tooth 10 of common general bond d ith th d bed th r b n th shape mounted in a holder "11 of suitablecon- When the compacted surface of the road struction, the holder being adapte'd't'o ,be was thinner and When traffic was lighter, it m d over the sur a e of a oadbed by any was customary to perform this operation by suitable means. The lower end 12 of the 7 d i i teeth below the acted or hardtooth is forced downward into a road bed ened crust of the road, so that the points of 13,, which is shown to be compacted for a the teeth moved in comparatively ft dirt greater depth than that reached by the'tooth. beneath the hard surface of the road, most of The tooth is constructed 1 of a body pora,

the work being performed by the front face tion 14 and a point 12 at either end thereof.

of the, tooth Under such circumstances Each point 12 is constructed of a Wearplate there was not excessive wear upon the point 15, which is positioned upon the front side of th tooth, of the point and is fastened to the front side It has now become customary, because of of the body portion 14; Aseries of brace the increased depth of the compacted surplates 16 17, 18 and up toany desired numface, to dig only part way through the ber are provided between the end of body compacted portion when merely smoothportion 14 andthe back side of Wear plate 15.

ing the road surface. Under such circum- These brace plates are preferablyseparat'e stances the point of the tooth is moving from each other, but are attached at their through dense compacted material. This ends to the wear plate and to the body porwears the point of the tooth very rapidly. tion by any suitable means. .In the construc- Asidc from the point that the ear on the tion illustrated, each brace plate iSCOIinGCted tooth causes great expense in resharpening to the wear plate by spot weldingat thelowor renewing the tooth at frequent inest point of contact 30 and is also spot-weldv tervals, it also happens that the workmen ed at 31 to'the lower end ofthe body -porperforming the scarifying operation fretion. y quently become negligent and do not re- The operation of the device is asfollows; sharpen or renew the teeth as promptly as The tooth is forcedinto the road bed'by they should. The dull teeth do not enter into suitable means and moved along therein.

the surface of the road sufliciently to dig The result is to rapidly wear off the bottom up enough of the surface to result in a lastend of plate 15. As soon as the projecting ing smoothing job. The present invention point of wear plate 15 is worn off, wear be has been used to provide a tooth that will gins to take place on the bottom end of'bracc continue to operate at approximately maxiplate 16. When the wearhasproceeded far mum efliciency for at least half a day, so enough to erode away the weld line 30 con ion I be bent backward out of the way.

necting brace plate 17 to face plate 15, the

lower end of brace plate 16 is bent backward 'will then continue until plate 17 in its-turn is loosened at its lower end, when that also will In this able length of plate 15 has been worn off without the back of the tooth interfering seriously with the entry of the tooth into the road be When so much of wear plate 15 has been worn away that it will no longer operate efficiently, the tooth may be resharpened by removing wear plate'15 and any remaining portions of the brace plates and replacing them with new plates. If preferred, portion 15 might be made integral with body portion 14, but in that case the point of the tooth could not be so readily renewed.

Fromthe above description the construction and operation of the new tooth will be evident. It will also be evident that departures may be made from the exact form of the tooth while utilizing the principle thereof within the scope of the appended claims, and that while this tooth is intended primarily for scarifying road beds, it might be employed for other operations Where similar qualities are desirable.

What I claim is:

1. A tooth comprising a wear plate portion forming the point and the wearing side of the tooth, and a brace plate slanting back- I ward and upward from the rear side of the wear plate portion and attached to the wear plate portion at its lower end and to the body of the tooth at its upper end so that when the wear plate portion has worn ofl sufiiciently to release the attachment of the brace plate at its lower end, the brace plate may be bent plate extending downward from the front of said shoulder, and a plurality of brace plates attached tothe rear face of said wear plate, I

slanting upwardly and rearwardly, and attached at the upper end to said shoulder, said brace plates being laid face to face across the longitudinal direction of said tooth and being unattached to each other between their ends.

4. A digging tooth comprising a face plate adapted to receive wear on its lower end and front face and a laminated structure bracing the back of said face plate, the lamina of said structure slanting backward and upward from the back of the lower end of said tooth to a rigid abutment and being unattached to each other between the ends of said bracing structure.

In testimony whereof I have hereunto signed my name to' this specification.

ARTHUR B. WILSON. 

